.\" zip_file_get_external_attributes.mdoc -- get external attributes for file in zip
.\" Copyright (C) 2013 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP files.
.\" The authors can be contacted at <libzip@nih.at>
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.Dd September 19, 2013
.Dt ZIP_FILE_GET_EXTERNAL_ATTRIBUTES 3
.Os
.Sh NAME
.Nm zip_file_get_external_attributes
.Nd get external attributes for file in zip
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft const char *
.Fn zip_file_get_external_attributes "struct zip *archive" "zip_uint64_t index" "zip_flags_t flags" \
"zip_uint8_t *opsys" "zip_uint32_t *attributes"
.Sh DESCRIPTION
The
.Fn zip_file_get_external_attributes
function returns the operating system and external attributes for the
file at position
.Ar index
in the zip archive.
The external attributes usually contain the operating system-specific
file permissions.
If
.Ar flags
is set to
.Dv ZIP_FL_UNCHANGED ,
the original unchanged values are returned.
If
.Ar opsys
or
.Ar attributes
are
.Dv NULL ,
they are not filled in.
.Pp
The following operating systems are defined by the zip specification:
.Bl -item -compact -offset indent
.It
.Dv ZIP_OPSYS_ACORN_RISC
.It
.Dv ZIP_OPSYS_ALTERNATE_MVS
.It
.Dv ZIP_OPSYS_AMIGA
.It
.Dv ZIP_OPSYS_ATARI_ST
.It
.Dv ZIP_OPSYS_BEOS
.It
.Dv ZIP_OPSYS_CPM
.It
.Dv ZIP_OPSYS_DOS
.It
.Dv ZIP_OPSYS_MACINTOSH
.It
.Dv ZIP_OPSYS_MVS
.It
.Dv ZIP_OPSYS_OPENVMS
.It
.Dv ZIP_OPSYS_OS_2
.It
.Dv ZIP_OPSYS_OS_400
.It
.Dv ZIP_OPSYS_OS_X
.It
.Dv ZIP_OPSYS_TANDEM
.It
.Dv ZIP_OPSYS_UNIX
.It
.Dv ZIP_OPSYS_VFAT
.It
.Dv ZIP_OPSYS_VM_CMS
.It
.Dv ZIP_OPSYS_VSE
.It
.Dv ZIP_OPSYS_WINDOWS_NTFS
(uncommon, use
.Dv ZIP_OPSYS_DOS
instead)
.It
.Dv ZIP_OPSYS_Z_SYSTEM
.El
.Pp
The defines above follow the PKWARE Inc. Appnote; please note that
the InfoZIP Appnote has a slightly different mapping.
.Sh RETURN VALUES
Upon successful completion, 0 is returned.
In case of an error,
.Dv \-1
is returned and the error code in
.Ar archive
is set to indicate the error.
.Sh ERRORS
.Fn zip_file_get_external_attributes
fails if:
.Bl -tag -width Er
.It Bq Er ZIP_ER_INVAL
.Ar index
is not a valid file index in
.Ar archive .
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_file_set_external_attributes 3
.Sh EXAMPLES
The following code can be used to expand
.Ar attributes
if the operating system is
.Dv ZIP_OPSYS_DOS .
.Bd -literal
#include <sys/stat.h>

#define FA_RDONLY       0x01            // FILE_ATTRIBUTE_READONLY
#define FA_DIREC        0x10            // FILE_ATTRIBUTE_DIRECTORY

static mode_t
_zip_dos_attr2mode(zip_uint32_t attr)
{
   mode_t m = S_IRUSR | S_IRGRP | S_IROTH;
   if (0 == (attr & FA_RDONLY))
      m |= S_IWUSR | S_IWGRP | S_IWOTH;

   if (attr & FA_DIREC)
      m = (S_IFDIR | (m & ~S_IFMT)) | S_IXUSR | S_IXGRP | S_IXOTH;

   return m;
}
.Ed
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at
